+++ /dev/null
-// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
-// file at the top-level directory of this distribution and at
-// http://rust-lang.org/COPYRIGHT.
-//
-// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
-// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
-// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
-// option. This file may not be copied, modified, or distributed
-// except according to those terms.
-
-#![unstable(feature = "rustc_private")]
-#![deprecated(since = "1.0.0", reason = "use std::vec::CowVec")]
-
-pub use self::MaybeOwnedVector::*;
-
-use std::cmp::Ordering;
-use std::default::Default;
-use std::fmt;
-use std::iter::FromIterator;
-use std::old_path::BytesContainer;
-use std::slice;
-
-// Note 1: It is not clear whether the flexibility of providing both
-// the `Growable` and `FixedLen` variants is sufficiently useful.
-// Consider restricting to just a two variant enum.
-
-// Note 2: Once Dynamically Sized Types (DST) lands, it might be
-// reasonable to replace this with something like `enum MaybeOwned<'a,
-// U: ?Sized>{ Owned(Box<U>), Borrowed(&'a U) }`; and then `U` could be
-// instantiated with `[T]` or `str`, etc. Of course, that would imply
-// removing the `Growable` variant, which relates to note 1 above.
-// Alternatively, we might add `MaybeOwned` for the general case but
-// keep some form of `MaybeOwnedVector` to avoid unnecessary copying
-// of the contents of `Vec<T>`, since we anticipate that to be a
-// frequent way to dynamically construct a vector.
-
-/// MaybeOwnedVector<'a,T> abstracts over `Vec<T>`, `&'a [T]`.
-///
-/// Some clients will have a pre-allocated vector ready to hand off in
-/// a slice; others will want to create the set on the fly and hand
-/// off ownership, via `Growable`.
-pub enum MaybeOwnedVector<'a,T:'a> {
- Growable(Vec<T>),
- Borrowed(&'a [T]),
-}
-
-/// Trait for moving into a `MaybeOwnedVector`
-pub trait IntoMaybeOwnedVector<'a,T> {
- /// Moves self into a `MaybeOwnedVector`
- fn into_maybe_owned(self) -> MaybeOwnedVector<'a,T>;
-}
-
-#[allow(deprecated)]
-impl<'a,T:'a> IntoMaybeOwnedVector<'a,T> for Vec<T> {
- #[allow(deprecated)]
- #[inline]
- fn into_maybe_owned(self) -> MaybeOwnedVector<'a,T> { Growable(self) }
-}
-
-#[allow(deprecated)]
-impl<'a,T> IntoMaybeOwnedVector<'a,T> for &'a [T] {
- #[allow(deprecated)]
- #[inline]
- fn into_maybe_owned(self) -> MaybeOwnedVector<'a,T> { Borrowed(self) }
-}
-
-impl<'a,T> MaybeOwnedVector<'a,T> {
- pub fn iter(&'a self) -> slice::Iter<'a,T> {
- match self {
- &Growable(ref v) => v.as_slice().iter(),
- &Borrowed(ref v) => v.iter(),
- }
- }
-
- pub fn len(&self) -> uint { self.as_slice().len() }
-
- #[allow(deprecated)]
- pub fn is_empty(&self) -> bool { self.len() == 0 }
-}
-
-impl<'a, T: PartialEq> PartialEq for MaybeOwnedVector<'a, T> {
- fn eq(&self, other: &MaybeOwnedVector<T>) -> bool {
- self.as_slice() == other.as_slice()
- }
-}
-
-impl<'a, T: Eq> Eq for MaybeOwnedVector<'a, T> {}
-
-impl<'a, T: PartialOrd> PartialOrd for MaybeOwnedVector<'a, T> {
- fn partial_cmp(&self, other: &MaybeOwnedVector<T>) -> Option<Ordering> {
- self.as_slice().partial_cmp(other.as_slice())
- }
-}
-
-impl<'a, T: Ord> Ord for MaybeOwnedVector<'a, T> {
- fn cmp(&self, other: &MaybeOwnedVector<T>) -> Ordering {
- self.as_slice().cmp(other.as_slice())
- }
-}
-
-// The `Vector` trait is provided in the prelude and is implemented on
-// both `&'a [T]` and `Vec<T>`, so it makes sense to try to support it
-// seamlessly. The other vector related traits from the prelude do
-// not appear to be implemented on both `&'a [T]` and `Vec<T>`. (It
-// is possible that this is an oversight in some cases.)
-//
-// In any case, with `Vector` in place, the client can just use
-// `as_slice` if they prefer that over `match`.
-
-impl<'b,T> AsSlice<T> for MaybeOwnedVector<'b,T> {
- fn as_slice<'a>(&'a self) -> &'a [T] {
- match self {
- &Growable(ref v) => v.as_slice(),
- &Borrowed(ref v) => v.as_slice(),
- }
- }
-}
-
-impl<'a,T> FromIterator<T> for MaybeOwnedVector<'a,T> {
- #[allow(deprecated)]
- fn from_iter<I:Iterator<Item=T>>(iterator: I) -> MaybeOwnedVector<'a,T> {
- // If we are building from scratch, might as well build the
- // most flexible variant.
- Growable(iterator.collect())
- }
-}
-
-impl<'a,T:fmt::Debug> fmt::Debug for MaybeOwnedVector<'a,T> {
- fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
- self.as_slice().fmt(f)
- }
-}
-
-impl<'a, T: Clone> Clone for MaybeOwnedVector<'a, T> {
- #[allow(deprecated)]
- fn clone(&self) -> MaybeOwnedVector<'a, T> {
- match *self {
- Growable(ref v) => Growable(v.clone()),
- Borrowed(v) => Borrowed(v)
- }
- }
-}
-
-impl<'a, T> Default for MaybeOwnedVector<'a, T> {
- #[allow(deprecated)]
- fn default() -> MaybeOwnedVector<'a, T> {
- Growable(Vec::new())
- }
-}
-
-impl<'a> BytesContainer for MaybeOwnedVector<'a, u8> {
- fn container_as_bytes(&self) -> &[u8] {
- self.as_slice()
- }
-}
-
-impl<'a,T:Clone> MaybeOwnedVector<'a,T> {
- /// Convert `self` into a growable `Vec`, not making a copy if possible.
- pub fn into_vec(self) -> Vec<T> {
- match self {
- Growable(v) => v,
- Borrowed(v) => v.to_vec(),
- }
- }
-}
projects / rust.git / commitdiff